Originally Posted by
Sailandfly
I always only submit my UC for the long leg that I want to be upgraded on. My first leg (outbound) I usually get a CMU. This way if the GUC does not clear on the TATL I won't be burning an UC for a short leg like SDF - ATL.
Sure, but this is not really relevant here as the OP requires GUCs to upgrade both international segments. DL should absolutely refund the GUC in this instance, although I am also curious when the SEA-NRT GUC cleared (at the gate or beforehand?).
-FlyerBeek